Cold insulated cabinet

ABSTRACT

A cold-insulation container is disclosed which includes a cold-insulation container main body ( 1 ) which is a heat-insulation structure and a door ( 2 ) for opening and closing an opening portion ( 4 ) of the cold-insulation container main body ( 1 ). Provided in the cold-insulation container main body ( 1 ) are a refrigerating apparatus ( 19 ) and a cold-storage device ( 20 ) which is cooled by the refrigerating apparatus ( 19 ) and stores cold. An external wall of the cold-insulation container main body ( 1 ) and the door  2  are formed from a synthetic resin material.

TECHNICAL FIELD

The present invention relates to a cold-insulation container that isloaded on a vehicle such as a truck and transported. The presentinvention relates more particularly to an external-wall structure forsuch a cold-insulation container.

BACKGROUND ART

A typical type of cold-insulation container which is loaded on a vehiclesuch as a truck and transported includes a cold-keeping means comprisinga refrigerating apparatus and a cold-storage device which is cooled bythe refrigerating apparatus and stores cold. The refrigerating apparatusis operated only at the storage warehouse of a delivery terminal. Duringtransportation, the refrigerating apparatus is not operated and thecold-keeping of products to be kept cold which are contained in thecold-insulation container is performed using cold which has been storedin the cold-storage device.

In such a type of cold-insulation container, its cold-insulationcontainer main body and door employ a heat-insulation structure of steelsheet.

PROBLEMS TO BE SOLVED

In order to cut transportation costs, it is necessary to reduce theweight of a cold-insulation container of the above type. However, asstated above, such a cold-insulation container employs a heat-insulationstructure of steel sheets which is heavy. This gives rise to theinconvenience that the weight of a cold-insulation container becomesapproximately the same as that of products to be cooled which are storedin the cold-insulation container. For example, the weight of acold-insulation container with a load capacity of 300 kg is 300 kg.

Bearing in mind the above-described problem, the present invention wasmade. Accordingly, an object of the present invention is to improvetransportation efficiency by forming an external wall of acold-insulation container main body and a door with a synthetic resinfor weight reduction.

DISCLOSURE OF THE INVENTION

A first invention is disclosed which comprises a cold-insulationcontainer main body 1 which is a heat-insulation structure, a door 2 foropening and closing an opening portion 4 of the cold-insulationcontainer main body 1, and a cold-keeping means 3 which is disposed inthe cold-insulation container main body 1. And, the cold-keeping means 3includes a refrigerating apparatus 19 which is positioned in thecold-insulation container main body 1 and a cold-storage device 20 whichis cooled by the refrigerating apparatus 19 and stores cold. Inaddition, an external wall of the cold-insulation container main body 1and the door 2 are formed from a synthetic resin material.

In the first invention, the cold-insulation container main body 1 andthe door 2 are reduced considerably in their weight, thereby resultingin the increase in loadable weight. Accordingly, there is achieved aconsiderable improvement in transportation efficiency.

A second invention according to the first invention is disclosed inwhich outwardly projecting portions 25 and 26 for reinforcement areformed on the external wall of the cold-insulation container main body 1and on the door 2, respectively.

In the second invention, the section modulus of the cold-insulationcontainer main body 1 and the door 2 increases, whereby the externalwall structural strength of the cold-insulation container is improved.Further, at the time of handling a cold-insulation container, even whenit collides with another cold-insulation container, such collisioncontact will occur between the reinforcement projecting portions 25 and26 of one of the cold-insulation containers and the reinforcementprojecting portions 25 and 26 of the other cold-insulation container.Consequently, the structural strength against collision load isenhanced.

A third invention is disclosed which comprises a cold-insulationcontainer main body 1 which is a heat-insulation structure, a door 2 foropening and closing an opening portion 4 of the cold-insulationcontainer main body 1, and a cold-keeping means 3 which is disposed inthe cold-insulation container main body 1. And, an external wall of thecold-insulation container main body 1 and the door 2 are formed from asynthetic resin material. In addition, outwardly projecting portions 25and 26 for reinforcement are formed on the external wall of thecold-insulation container main body 1 and on the door 2, respectively.

In the third invention, the cold-insulation container main body 1 andthe door 2 are reduced considerably in their weight, thereby resultingin the increase in loadable weight. Accordingly, there is achieved aconsiderable improvement in transportation efficiency. Further, at thetime of handling a cold-insulation container, even when it collides withanother cold-insulation container, such collision contact will occurbetween the reinforcement projecting portions 25 and 26 of one of thecold-insulation containers and the reinforcement projecting portions 25and 26 of the other cold-insulation container. Consequently, thestructural strength against collision load is enhanced.

A fourth invention according to the second or third invention isdisclosed in which the external wall of the cold-insulation containermain body 1 and the door 2 are constructed by filling a heat-insulationmaterial 13 between a synthetic-resin internal plate 11 and asynthetic-resin external plate 12, and by filling a heat-insulationmaterial 16 between a synthetic-resin internal plate 14 and asynthetic-resin external plate 15. Further, the reinforcement projectingportions 25 and 26 are formed by causing the external plates 12 and 15to project outwardly.

In the fourth invention, the reinforcement projecting portions 12 and 15are formed by only causing the external plates 12 and 15 to projectoutwardly. Furthermore, the thickness of the heat-insulation materials13 and 16 in the reinforcement projecting portions 25 and 26 increases,thereby providing an improvement in heat-insulation efficiency.

A seventh invention according to the second or third invention isdisclosed in which the external wall of the cold-insulation containermain body 1 and the door 2 are constructed by filling a heat-insulationmaterial 13 between a synthetic-resin internal plate 11 and asynthetic-resin external plate 12, and by filling a heat-insulationmaterial 16 between a synthetic-resin internal plate 14 and asynthetic-resin external plate 15. Further, the reinforcement projectingportions 25 and 26 are formed outwardly from and integrally with theexternal plates 12 and 15, having therein space portions 27 and 28.

In the seventh invention, it is sufficient that the reinforcementprojecting portions 25 and 26 are formed outwardly from and integrallywith the external plates 12 and 15. Further, by virtue of the provisionof the space portions 27 and 28 formed in the reinforcement projectionportions 25 and 26, the heat-insulation efficiency at these portions isimproved.

A tenth invention according to the second or third invention isdisclosed in which the external wall of the cold-insulation containermain body 1 and the door 2 are constructed by filling a heat-insulationmaterial 13 between a synthetic-resin internal plate 11 and asynthetic-resin external plate 12, and by filling a heat-insulationmaterial 16 between a synthetic-resin internal plate 14 and asynthetic-resin external plate 15. Further, the reinforcement projectingportions 25 and 26 are formed by increasing the thickness of theexternal plates 12 and 15.

In the tenth invention, it is possible to form the reinforcementprojecting portions 25 and 26 by only increasing the thickness of theexternal plates 12 and 15.

Further, such increase in the thickness of the external plates 12 and 15provides an improvement in the strength of the reinforcement projectingportions 25 and 26.

A fifth, an eighth, and an eleventh invention according to the fourth,the seventh, and the tenth invention, respectively, are disclosed ineach of which ribs 29 and 30 for connecting the internal plates 11 and14 to the external plates 12 and 15 are formed at base portions of thereinforcement projecting portions 25 and 26.

In each of these inventions, the internal plates 11 and 14 and theexternal plates 12 and 15 are reinforced by the ribs 29 and 30, therebyimproving the strength to a further extent.

A sixth, a ninth, and a twelfth invention according to the fourth, theseventh, and the tenth invention, respectively, are disclosed in each ofwhich outwardly-facing projecting portions 31 and 32 corresponding tothe reinforcement projecting portions 25 and 26 are formed at portionsof the internal plates 11 and 14 corresponding to the reinforcementprojecting portions 25 and 26.

In each of these inventions, the section modulus of the internal plates11 and 14 also increases. Consequently, the strength of the internalplates 11 and 14 is improved and the capacity of the cold-insulationcontainer main body 1 also increases.

A thirteenth invention according to the second or third invention isdisclosed in which elastic members 33 and 34 are attached to outersurfaces of the reinforcement projecting portions 25 and 26.

In the thirteenth invention, at the time of handling a cold-insulationcontainer, even when it collides with another cold-insulation container,the elastic members 33 and 34 absorb a collision load. Consequently, thecold-insulation container main body 1 and the door 2 are made furtherlighter in weight.

A fifteenth invention according to the second or third invention isdisclosed in which elastic members 33 and 34 are attached to theexternal wall of the cold-insulation container main body 1 and the door2 so that the elastic members 33 and 34 project outwardly beyond thereinforcement projecting portions 25 and 26.

In the fifteenth invention, at the time of handling a cold-insulationcontainer and even when it collides with another cold-insulationcontainer, the elastic members 33 and 34 absorb a collision load.Consequently, the cold-insulation container main body 1 and the door 2are made further lighter in weight.

A fourteenth and a sixteenth invention according to the thirteenth andthe fifteenth invention, respectively, are disclosed in each of whichhollow portions 35 and 36 are formed in the elastic members 33 and 34.

In each of these inventions, the absorption efficiency of collision loadis improved by the elastic members 33 and 34.

A seventeenth invention according to the second or third invention isdisclosed in which a recessed portion 42 is formed at a corner portion Cof portions sandwiching therebetween the reinforcement projectingportion 25 in the cold-insulation container main body 1, the recessedportion 42 extending astride both lateral walls from the corner portionC.

In the seventeenth invention, when handling a cold-insulation container,it is possible to prevent fingers of a handler from being caught betweenthe cold-insulation container and its neighboring cold-insulationcontainer by pushing it with the fingers placed thereon. Consequently,this not only improves safety during cold-insulation container handlingbut also insures heat-insulation efficiency because there is no need tomake the entire portion other than the reinforcement projecting portion25 in the external wall of the cold-insulation container main body 1thin.

An eighteenth invention according to the seventeenth invention isdisclosed in which a handle 41 that is held when handling acold-insulation container is positioned in the reinforcement projectingportion 25 sandwiched between the recessed portions 42.

In the eighteenth invention, although there is a possibility of handlinga cold-insulation container with a hand of the handler placed on thecorner portion C near the handle 41, fingers of the handler are, at thattime, placed in the recessed portions 42. Consequently, this preventsthe fingers from being caught between the cold-insulation container andits neighboring cold-insulation container.

A nineteenth invention according to the second or third invention isdisclosed in which the external wall of the cold-insulation containermain body 1 and the door 2 are constructed by filling a heat-insulationmaterial 13 between a synthetic-resin internal plate 11 and asynthetic-resin external plate 12, and by filling a heat-insulationmaterial 16 between a synthetic-resin internal plate 14 and asynthetic-resin external plate 15. Further, the thickness of theexternal plates 12 and 15 of the cold-insulation container main body 1and the door 2 is greater than that of the internal plates 11 and 14 ofthe cold-insulation container main body 1 and the door 2.

In the nineteenth invention, the ensuring of weight reduction and theensuring of strength are compatible. That is, the external plates 12 and15 to which great force such as collision load acts on are made thick tosecure strength and, on the other hand, the internal plates 11 and 14are made thin to achieve the reduction in weight.

A twentieth invention according to the fourth invention is disclosed inwhich the thickness of the reinforcement projecting portion 25 of theexternal plate 12 in the external wall of the cold-insulation containermain body 1 is greater than that of portions of the external plate 12other than the reinforcement projecting portion 25.

In the twentieth invention, it is possible to provide a degree ofstrength strong enough to withstand collision load etc.

A twenty-first invention according to the fourth invention, thereinforcement projecting portion 25 of the external plate 12 in theexternal wall of the cold-insulation container main body 1 is projected5 mm or more.

In the twenty-first invention, it is possible to provide a sufficientdegree of strength against collision or the like.

A twenty-second invention according to the second or third invention isdisclosed in which the occupation ratio of the reinforcement projectingportions 25 and 26 of the external wall of the cold-insulation containermain body 1 and the door 2 is equal to or greater than that of portionsother than the reinforcement projecting portion 25 of the external walland the door 2.

In the twenty-second invention, the occupation ratio of thereinforcement projecting portions 25 and 26 is great, thereby ensuringthat a specified degree of strength is obtained positively.

Finally, a twenty-third invention according to the thirteenth inventionis disclosed in which attachment grooves 25 a and 26 a for the elasticmembers 33 and 34 are formed in the reinforcement projecting portions 25and 26 in the external wall of the cold-insulation container main body 1and the door 2. Further, the elastic members 33 and 34 are attached intothe attachment grooves 25 a and 26 a.

In the twenty-third invention, the attachment grooves 25 a and 26 a areformed in the external plates 12 and 15.

As a result of such arrangement, the section modulus of the externalplates 12 and 15 increases, thereby improving the degree of strength toa further extent. Moreover, the positioning of the elastic members 33and 34 is carried out accurately.

EFFECTS OF THE INVENTION

In accordance with the first invention, the external wall of thecold-insulation container main body 1 and the door 2 are formed from asynthetic resin material, thereby making it possible to considerablyreduce the weight of the cold-insulation container main body 1 and thedoor 2. This results in the increase in loadable weight, therebyproviding a considerable improvement in transportation efficiency.

In accordance with the second invention, the reinforcement projectingportions 25 and 26 which project outwardly are formed on the externalwall of the cold-insulation container main body 1 and on the door 2,respectively, thereby making it possible to increase the section modulusof the cold-insulation container main body and the door 2. As a result,it is possible to improve the external wall structural strength of thecold-insulation container.

Further, at the time of handling a cold-insulation container, even whenit collides with another cold-insulation container, such collisioncontact will occur between the reinforcement projecting portions 25 and26 of one of the cold-insulation containers and the reinforcementprojecting portions 25 and 26 of the other cold-insulation container.Consequently, the strength against collision load is enhanced.

In accordance with the third invention, the external wall of thecold-insulation container main body 1 and the door 2 are formed of asynthetic resin material and, in addition, the outwardly projecting,reinforcement projecting portions 25 and 26 are formed on the externalwall of the cold-insulation container main body 1 and on the door 2,respectively, so that the cold-insulation container main body 1 and thedoor 2 are reduced considerably in their weight. This results in theincrease in loadable weight, thereby providing a considerableimprovement in transportation efficiency.

Further, at the time of handling a cold-insulation container, even whenit collides with another cold-insulation container, such collisioncontact will occur between the reinforcement projecting portions 25 and26 of one of the cold-insulation containers and the reinforcementprojecting portions 25 and 26 of the other cold-insulation container.Consequently, the strength against collision load is enhanced.

In accordance with the fourth invention, the external wall of thecold-insulation container main body 1 and the door 2 are constructed byfilling the heat-insulation material 13 between the synthetic-resininternal plate 11 and the synthetic-resin external plate 12, and byfilling the heat-insulation material 16 between the synthetic-resininternal plate 14 and the synthetic-resin external plate 15.

In addition, the reinforcement projection portions 25 and 26 are formedby causing the external plates 12 and 15 to project outwardly, wherebythe reinforcement projecting portions 12 and 15 can be formed by onlycausing the external plates 12 and 15 to project outwardly.

And besides, the thickness of the heat-insulation materials 13 and 16 inthe reinforcement projecting portions 25 and 26 increases, therebyproviding an improvement in heat-insulation efficiency.

In accordance with the seventh invention, the external all of thecold-insulation container main body 1 and the door 2 are constructed byfilling the heat-insulation material 13 between the synthetic-resininternal plate 11 and the synthetic-resin external plate 12, and byfilling the heat-insulation material 16 between the synthetic-resininternal plate 14 and the synthetic-resin external plate 15. Inaddition, the reinforcement projecting portions 25 and 26 are formedoutwardly from and integrally with the external plates 12 and 15, havingtherein the space portions 27 and 28. As a result, it is sufficient thatthe reinforcement projecting portions 25 and 26 are formed outwardlyfrom and integrally with the external plates 12 and 15.

Further, by virtue of the provision of the space portions 27 and 28formed in the reinforcement projection portions 25 and 26, theheat-insulation efficiency at these portions can be improved.

In accordance with the tenth invention, the external wall of thecold-insulation container main body 1 and the door 2 are constructed byfilling the heat-insulation material 13 between the synthetic-resininternal plate 11 and the synthetic-resin external plate 12, and byfilling the heat-insulation material 16 between the synthetic-resininternal plate 14 and the synthetic-resin external plate 15.

In addition, the reinforcement projecting portions 25 and 26 are formedby increasing the thickness of the external plates 12 and 15. It istherefore possible to form the reinforcement projecting portions 25 and26 by only increasing the thickness of the external plates 12 and 15.

And besides, such increase in the thickness of the external plates 12and 15 improves the strength of the reinforcement projecting portions 25and 26.

In accordance with each of the fifth, the eighth, and the eleventhinvention, the ribs 29 and 30 for connecting the internal plates 11 and14 to the external plates 12 and 15 are formed at the base portions ofthe reinforcement projecting portions 25 and 26. As a result of sucharrangement, the internal plates 11 and 14 and the external plates 12and 15 are reinforced by the ribs 29 and 30, thereby improving thestrength to a further extent.

In accordance with each of the sixth, the ninth, and the twelfthinvention, the outwardly-facing projecting portions 31 and 32corresponding to the reinforcement projecting portions 25 and 26 areformed at the portions of the internal plates 11 and 14 corresponding tothe reinforcement projecting portions 25 and 26. As a result of sucharrangement, the section modulus of the internal plates 11 and 14 canalso be increased. Consequently, the strength of the internal plates 11and 14 can be improved and the capacity of the cold-insulation containermain body 1 can also be increased.

In accordance with the thirteenth invention, the elastic members 33 and34 are attached to the outer surfaces of the reinforcement projectingportions 25 and 26 As a result of such arrangement, at the time ofhandling a cold-insulation container, even when it collides with anothercold-insulation container, the elastic members 33 and 34 absorb acollision load. Consequently, the cold-insulation container main body 1and the door 2 can be made further lighter in weight.

In accordance with the fifteenth invention, the elastic members 33 and34 are attached to the external wall of the cold-insulation containermain body 1 and the door 2, the elastic members 33 and 34 projectingoutwardly beyond the reinforcement projecting portions 25 and 26. As aresult of such arrangement, at the time of handling a cold-insulationcontainer, even when it collides with another cold-insulation container,the elastic members 33 and 34 absorb a collision load. Consequently, thecold-insulation container main body 1 and the door 2 can be made furtherlighter in their weight.

In accordance with each of the fourteenth and the sixteenth invention,the hollow portions 35 and 36 are formed in the elastic members 33 and34. As a result of such arrangement, the efficiency of absorption of acollision load is improved by the elastic members 33 and 34.

In accordance with the seventeenth invention, the recessed portion 42 isformed at the corner portion C of portions sandwiching therebetween thereinforcement projecting portion 25 in the cold-insulation containermain body 1, the recessed portion 42 extending astride both lateralwalls from the corner portion C. As a result of such arrangement, whenhandling a cold-insulation container, it is possible to prevent fingersof the handler from being caught between the cold-insulation containerand its neighboring cold-insulation container by pushing it with thefingers placed within the recessed portion 42. Consequently, thisimproves the safety at cold-insulation container handling time.

Further, it is possible to insure heat-insulation efficiency becausethere is no need to make the entire portion other than the reinforcementprojecting portion 25 in the external wall of the cold-insulationcontainer main body 1 thin.

In accordance with the eighteenth invention, the handle 41 that is heldwhen handling a cold-insulation container is positioned on thereinforcement projecting portion 25 sandwiched between the recessedportions 42, so that, although there is a possibility of handling thecold-insulation container with a hand placed on the corner portion Cnear the handle 41, fingers of the handler are, at that time, placed inthe recessed portions 42. Consequently, this prevents the fingers frombeing caught between the cold-insulation container and its neighboringcold-insulation container.

In accordance with the nineteenth invention, the thickness of theexternal plates 12 and 15 of the cold-insulation container main body 1and the door 2 is made greater than that of the internal plates 11 and14 of the cold-insulation container main body 1 and the door 2. As aresult of such arrangement, ensuring weight reduction and ensuringstrength are compatible. That is, the external plates 12 and 15 to whichgreat force such as collision load acts on are made thick to securestrength and, on the other hand, the internal plates 11 and 14 are madethin to achieve weight reduction.

In accordance with the twentieth invention, the thickness of thereinforcement projecting portions 25 and 26 is made greater than otherportions of the external plates 12 and 15. As a result of sucharrangement, it is possible to provide strength strong enough towithstand collision load et cetera.

In accordance with the twenty-first invention, the reinforcementprojecting portions 25 and 26 are projected 5 mm or more. As a result ofsuch arrangement, it is possible to provide a sufficient degree ofstrength against collision et cetera.

In accordance with the twenty-second invention, in the external plates12 and 15 of the portions corresponding to the cold-insulation chamber5, the occupation ratio of the reinforcement projecting portions 25 and26 is made equal to or greater than that of the other portions thereof.Such arrangement ensures that a specified degree of strength is obtainedpositively.

Finally, in accordance with the twenty-third invention, the attachmentgrooves 25 a and 26 a for the elastic members 33 and 34 are formed inthe external plates 12 and 15. As a result of such arrangement, thesection modulus of the external plates 12 and 15 increases, therebyimproving the strength to a further extent. And besides, since theelastic members 33 and 34 are attached into the attachment grooves 25 aand 26 a, the positioning of the elastic members 33 and 34 can becarried out accurately.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of a cold-insulation container according to afirst embodiment of the present invention, with a part thereof shown incross section.

FIG. 2 is a front view of the cold-insulation container of the firstembodiment of the present invention, with a part thereof shown in crosssection.

FIG. 3 is an enlarged cross-sectional structural view showing anexternal wall of a cold-insulation container main body and a door in thecold-insulation container of the first embodiment of the presentinvention.

FIG. 4 is an enlarged cross-sectional structural view showing anexternal wall of a cold-insulation container main body and a door in acold-insulation container according to a second embodiment of thepresent invention.

FIG. 5 is an enlarged cross-sectional structural view showing anexternal wall of a cold-insulation container main body and a door in acold-insulation container according to a third embodiment of the presentinvention.

FIG. 6 is an enlarged cross-sectional structural view showing anexternal wall of a cold-insulation container main body and a door in acold-insulation container according to a fourth embodiment of thepresent invention.

FIG. 7 is an enlarged cross-sectional structural view showing anexternal wall of a cold-insulation container main body and a door in acold-insulation container according to a fifth embodiment of the presentinvention.

FIG. 8 is an enlarged cross-sectional structural view showing anexternal wall of a cold-insulation container main body and a door in acold-insulation container according to a sixth embodiment of the presentinvention.

FIG. 9 is a side view of a cold-insulation container according to aseventh embodiment of the present invention.

FIG. 10 is a front view of the cold-insulation container of the seventhembodiment of the present invention.

FIG. 11 is an enlarged cross-sectional view taken along XI-XI of FIG. 9.

FIG. 12 is an enlarged cross-sectional view of XII of FIG. 9.

BEST MODES FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described indetail with reference to the accompanying drawings.

First Embodiment

Referring to FIGS. 1 to 3, there is shown a cold-insulation containeraccording to a first embodiment of the present invention.

The cold-insulation container of the first embodiment is loaded on avehicle such as a truck and transported. As shown in FIGS. 1 and 2, thecold-insulation container is comprised of a cold-insulation containermain body 1 of heat-insulation structure, a door 2 for opening andclosing an opening portion 4 of the cold-insulation container main body1, and a cold-keeping means 3 disposed in the cold-insulation containermain body 1.

The cold-insulation container main body 1 has, at its front side, theopening portion 4 through which products to be cooled are got in and outand is formed into a box-like shape of an oblong rectangular solid. Thecold-insulation container main body 1 includes a cold-insulation chamber5 for accommodating therein products to be cooled and a machine chamber6 zone-formed above a top plate 5 a of the cold-insulation chamber 5 andcovered with a lid cover 7.

Further, formed in the lid cover 7 are an air drawing opening 8 throughwhich air is fed to the machine chamber 6 and an air blowing-out opening9 through which air is blown out from the machine chamber 6. Mounted atportions of the bottom of the cold-insulation container main body 1 arecasters 10 for moving the cold-insulation container.

An external wall of the cold-insulation chamber 5 in the cold-insulationcontainer main body 1 is comprised of the top plate 5 a, both lateralplates 5 b and 5 b, a rear plate 5 c, and a bottom plate 5 d. Theexternal wall of the cold-insulation chamber 5 is constructed by fillinga heat-insulation material 13 between an internal plate 11 and anexternal plate 12, wherein the internal and external plates 11 and 12are formed of synthetic resin. Further, an external wall of the machinechamber 6 is formed from a single plate which is formed of syntheticresin.

The door 2 is constructed by filling a heat-insulation material 16between an internal plate 14 and an external plate 15, wherein theinternal and external plates 14 and 15 are formed of synthetic resin.Further, mounted on the cold-insulation container is a handle 17 foropening and closing the door 2. Besides, a locking device 18 formaintaining the door 2 in its closed state is provided in thecold-insulation container.

The cold-keeping means 3 is made up of a refrigerating apparatus 19 anda cold-storage device 20 which is cooled by the refrigerating apparatus19 and stores cold.

The refrigerating apparatus 19 includes a compressor 21 disposed in themachine chamber 6, a condenser 22 disposed in the machine chamber 6, andan evaporator 23 disposed at an upper portion of the cold-insulationchamber 5. And, the cold-storage device 20 is disposed next to theevaporator 23.

The refrigerating apparatus 19 has an accumulator 24 and a cooling fan38 for cooling the condenser 22. Moreover, the cold-keeping means 3 hasa drain pan 39.

The compressor 21, the condenser 22, the evaporator 23, and theaccumulator 24 are sequentially connected together by a refrigerant linenot shown. Refrigerant is compressed in the compressor 21, thencondensed to a liquid form in the condenser 22, and depressurized by anexpansion valve (not shown). Thereafter, the refrigerant is evaporatedin the evaporator 23. By a latent heat of vaporization in the evaporator23, a cold-storage material housed in the cold-storage device 20 iscooled and the cold-storage device 20 stores cold. Further, therefrigerating apparatus 19 is operated only at the storage warehouse ofa delivery terminal. In other words, the refrigerating apparatus 19 isnot operated during transportation of the cold-insulation container.During the transportation, products to be cooled which are stored in thecold-insulation container are kept cool by cold stored in thecold-storage device 20.

Formed on the external wall of the cold-insulation chamber 5 in thecold-insulation container main body 1 are three reinforcement projectingportions 25, 25, and 25 vertically disposed at different levels. Eachreinforcement projecting portion 25 is continuous extending from one ofboth lateral faces to the other lateral face through a rear face of thecold-insulation chamber 5.

Additionally, formed on the door 2 are reinforcement projecting portions26, 26, and 26 which continuously extend from their correspondingreinforcement projecting portions 25, 25, and 25, respectively, whichare positioned on the side of the cold-insulation container main body 1.

As shown in FIG. 3, the reinforcement projecting portions 25 and 26 areformed by causing the external plates 12 and 15 to project outwardly.

The cold-insulation container constructed in the way described aboveprovides the following action and effects.

The cold-insulation container main body 1 and the door 2 becomeconsiderably lighter in weight, thereby making it possible to achieve anincrease in loadable weight. This considerably improves transportationefficiency.

Furthermore, because of the formation of the reinforcement projectingportions 25 and 26, it is possible to increase the section modulus ofthe cold-insulation container main body 1 and the door 2. As a result,it is possible to improve the external wall structural strength of thecold-insulation container.

Further, at cold-insulation container handling time, even when twocold-insulation containers A and A′ collide with each other as shown bya chain line of FIG. 3, such collision contact will occur between thereinforcement projecting portions of the cold-insulation container A andthe reinforcement projecting portions of the cold-insulation containerA′. Accordingly, the degree of strength against collision load of thecold-insulation container is enhanced.

Further, with the present embodiment, it is possible to form thereinforcement projecting portions 25 and 26 by only causing the externalplates 12 and 15 to project outwardly. Furthermore, the thickness of theheat-insulation materials 13 and 16 in the reinforcement projectingportions 25 and 26 increases, thereby providing an improvement inheat-insulation efficiency.

Second Embodiment

Referring to FIG. 4, there are shown an external-wall structure of acold-insulation container main body and a door structure in acold-insulation container according to a second embodiment of thepresent invention.

The reinforcement projecting portions 25 and 26 of the presentembodiment are formed outwardly from and integrally with the externalplates 12 and 15, having therein space portions 27 and 28.

In the present embodiment, it is sufficient that the reinforcementprojecting portions 25 and 26 are formed outwardly from and integrallywith the external plates 12 and 15. Further, by virtue of the spaceportions 27 and 28 formed in the reinforcement projecting portions 25and 26, the heat-insulation efficiency at these portions is improved.Other structures, action, and effects of the present embodiment are thesame as the first embodiment.

Third Embodiment

Referring to FIG. 5, there are shown an external-wall structure of acold-insulation container main body and a door structure in acold-insulation container according to a third embodiment of the presentinvention.

The reinforcement projecting portions 25 and 26 of the presentembodiment are formed by causing the external plates 12 and 15 toproject outwardly. Further, ribs 29 and 30 for connecting the internalplates 11 and 14 to the external plates 12 and 15 are formed integrallywith base portions of the reinforcement projecting portions 25 and 26.

In the present embodiment, the internal plates 11 and 14 and theexternal plates 12 and 15 are reinforced by the ribs 29 and 30 and thestrength is improved to a further extent. Other structures, action, andeffects of the present embodiment are the same as the first embodiment.

As in the second embodiment, the reinforcement projecting portions 25and 26 may be formed outwardly from and integrally with the externalplates 12 and 15, having therein the space portions 27 and 28. And, theribs 29 and 30 for connecting the internal plates 11 and 14 to theexternal plates 12 and 15 may be formed integrally with base portions ofthe reinforcement projecting portions 25 and 26.

Fourth Embodiment

Referring to FIG. 6, there are shown an external-wall structure of acold-insulation container main body and a door structure in acold-insulation container according to a fourth embodiment of thepresent invention.

The reinforcement projecting portions 25 and 26 of the presentembodiment are formed by increasing the thickness of the external plates12 and 15.

With the present embodiment, it is possible to form the reinforcementprojecting portions 25 and 26 by only increasing the thickness of theexternal plates 12 and 15. Further, by virtue of such increase in thethickness, the strength of the reinforcement projecting portions 25 and26 is improved. Other structures, action, and effects of the presentembodiment are the same as the first embodiment.

Further, as in the third embodiment, the ribs 29 and 30 for connectingthe internal plates 11 and 14 and the external plates 12 and 15 may beformed integrally with base portions of the reinforcement projectingportions 25 and 26.

Fifth Embodiment

Referring to FIG. 7, there is shown an external-wall structure of acold-insulation container main body and a door structure in acold-insulation container according to a fifth embodiment of the presentinvention.

Formed at portions of the internal plates 11 and 14 of the presentembodiment corresponding to the reinforcement projecting portions 25 and26 are outwardly-facing projecting portions 31 and 32 corresponding tothe reinforcement projecting portions 25 and 26.

In accordance with the present embodiment, the section modulus of theinternal plates 11 and 14 is also increased, thereby improving thedegree of strength of the internal plates 11 and 14. And besides, theinternal capacity of the cold-insulation container main body 1 alsoincreases. Other structures, action, and effects of the presentembodiment are the same as the first embodiment.

Further, as in the third embodiment, the ribs 29 and 30 for connectingthe internal plates 11 and 14 to the external plates 12 and 15 may beformed integrally with base portions of the reinforcement projectingportions 25 and 26.

Sixth Embodiment

Referring to FIG. 8, there is shown an external wall structure of acold-insulation container main body and a door structure in acold-insulation container according to a sixth embodiment of the presentinvention.

Attached by screws 37 to outer surfaces of the reinforcement projectingportions 25 and 26 of the present embodiment are elastic members 33 and34 formed of rubber or the like. Defined in the elastic members 33 and34 are hollow portions 35 and 36.

In accordance with the present embodiment, at cold-insulation containerhandling, even when cold-insulation containers A and A′ collide witheach other, the elastic members 33 and 34 absorb a collision load. Thismakes it possible to further reduce the weight of the cold-insulationcontainer main body 1 and the door 2. Other structures, action, andeffects of the present embodiment are the same as the first embodiment.

Further, as in the third embodiment, the ribs 29 and 30 for connectingthe internal plates 11 and 14 to the external plates 12 and 15 may beformed integrally with base portions of the reinforcement projectingportions 25 and 26.

Further, the elastic members 33 and 34 may be attached to the outersurfaces of the reinforcement projecting portions 25 and 26 of the firstto fifth embodiment, as in the present embodiment.

Seventh Embodiment

Referring to FIGS. 9 to 11, there is shown a cold-insulation containeraccording to a seventh embodiment of the present invention.

The door 2 of the present embodiment is fitted, in its closed state, inthe opening portion 4 of the cold-insulation container main body 1. Thedoor 2 is supported rotatably by hinges 40 and 40 at a right-hand sideedge of the opening portion 4 so that it is opened and closed in a freemanner.

Further, the locking device 18 is provided extending from the upper tothe lower edge of the opening portion 4 as well as from the upper tolower end of the door 2.

Further, of the reinforcement projecting portions 25, 25, and 25 in thecold-insulation container main body 1, the middle one is provided withhandles 41 (which are held when moving a cold-insulation container) atcorner portions in areas which are edge portions of the opening portion4 and at corner portions in areas which are both sides of the rear faceof the cold-insulation container main body 1, respectively.

Further, attached by adhesion to the external wall of thecold-insulation container main body 1 and the door 2 of the presentembodiment are the elastic members 33 and 34. The elastic members 33 and34 are located next to lower sides of the upper- and lower-sidereinforcement projecting portions 25 and 26. Furthermore, the elasticmembers 33 and 34 project outwardly beyond the reinforcement projectingportions 25 and 26. The structure of the elastic members 33 and 34 isthe same as that of the ones shown in the sixth embodiment.

Further, the elastic members 33 and 34 are not necessarily located nextto the reinforcement projecting portions 25 and 26. That is, the elasticmember 33 and 34 may be provided at any adequate location of a portionlocated between the reinforcement projecting portions 25 and 26 and thereinforcement projecting portions 25 and 26. More specifically, theelastic members 33 and 34 may be provided at any adequate location of aportion in the cold-insulation container main body 1 and the door 2where the reinforcement projecting portions 25 and 26 are not formed.

Further, in the present embodiment, the elastic members 33 and 34 areattached, by adhesion, to the external wall of the cold-insulationcontainer main body 1 and the door 2 in such a way that they are locatednext to the undersides of the upper- and lower-side reinforcementprojecting portions 25 and 26, projecting outwardly beyond thereinforcement projecting portions 25 and 26. The structure of theelastic members 33 and 34 is the same as that of the ones shown in thesixth embodiment. Further, the elastic members 33 and 34 are notnecessarily located next to the reinforcement projecting portions 25 and26; alternatively, they may be positioned at upper or lower portions ofthe reinforcement projecting portions 25 and 26 (i.e., portions wherethe reinforcement projecting portions 25 and 26 are not formed in theexternal wall of the cold-insulation container main body 1 and the door2).

Apart from the above, typically, this type of cold-insulation containeris loaded in the bed of a truck and transported. Accordingly, in orderto secure an amount of load that is transported at a time, there is theconstraint that such a cold-insulation container is limited in its outerdimensions.

On the other hand, in accordance with the present embodiment, theexternal wall of the cold-insulation container main body 1 isconstructed by filling the heat-insulation material 13 between thesynthetic-resin internal and external plates 11 and 12. In this case, itis required that the thickness of the external wall of thecold-insulation container main body 1 be increased in order to secure aspecified heat-insulation efficiency as well as a specified degree ofstrength. Further, it is also necessary to insure that the capacity ofthe cold-insulation chamber 5 in the cold-insulation container main body1 is the same as that of conventional ones.

Then, because of the above-stated constraint, the amount of projectionof the reinforcement projecting portion 25 must be reduced by anincrease in thickness of the external wall of the cold-insulationcontainer main body 1.

To cope with the above, in accordance with the present embodiment, whilereducing the amount of projection of the reinforcement projectingportion 25, a recessed portion 42 is formed (see FIG. 1). The recessedportion 42 is formed at a corner portion C of portions sandwichingtherebetween the middle reinforcement projecting portion 25 in saidcold-insulation container main body 1 where the handle 41 is positioned.The recessed portion 42 extends astride both lateral walls from thecorner portion C.

The recessed portion 42 is so formed as to have a size large enough toreceive therein fingers of a handler and a depth deep enough not tocause the fingers to project outwardly beyond the reinforcementprojecting portion 25. As a result of such arrangement, when moving acold-insulation container, it is possible to prevent fingers of ahandler from being caught between the cold-insulation container and itsneighboring one by pushing the cold-insulation container with thefingers placed in the recessed portion 42. This improves the safetyduring cold-insulation container movement. In addition, there is no needto make the entire portion other than the reinforcement projectingportion 25 in the external wall of the cold-insulation container mainbody 1 thin, therefore securing heat-insulation efficiency.

Further, in the present embodiment, the recessed portion 42 is formed atthe corner portion C of the portions sandwiching therebetween the middlereinforcement projecting portion 25 where the handle 41 is positioned.As a behavior of human beings, it is likely that, when a containerhandler handles a cold-insulation container, the container handlerlikely places his fingers on the corner portion C near the handle C.Also at that time, however, the fingers are placed in the recessedportion 42. As a result, the fingers will not be caught between thecold-insulation container that is being handled and its neighboring one.

Further, the recessed portion 42 is not necessarily formed at the cornerportion C of the portions sandwiching therebetween the middlereinforcement projecting portion 25. That is, the recessed portion 42can be formed at any position in which a container handler is able toeasily place his fingers. Other structures, action, and effects of thepresent embodiment are the same as the first embodiment.

Eighth Embodiment

Referring to FIG. 12, there are shown an external wall structure of acold-insulation container main body 1 and a door's 2 structure in acold-insulation container according to an eighth embodiment of thepresent invention.

In the present embodiment, the thickness of, for example, the externalwall of the cold-insulation container main body 1 in the cold-insulationcontainer of the second embodiment is concretely specified. Accordingly,the cold-insulation container of the present embodiment is identical inbasic structure with the cold-insulation container of the secondembodiment.

First of all, the thickness (t1) of the external wall of thecold-insulation container main body 1 and the door 2 is 50 mm. In otherwords, in the external wall of the cold-insulation chamber 5 of thecold-insulation container main body 1, particularly in the front/rearand left/right lateral faces, the thickness t1 defined between theinternal plate 11 and the external plate 12 other than the reinforcementprojecting portion 25 is set to a value of 50 mm. Further, in the door2, the thickness t1 between the internal plate 14 and the external plate15 other than the reinforcement projecting portion 25 is 50 mm.

Further, the thicknesses (t2, t3) of the external plate 12 of theexternal wall of the cold-insulation container main body 1 and theexternal plate 15 of the door 2 are greater than the thickness (t4) ofthe internal plate 11 of the external wall of the cold-insulationcontainer main body 1 and the internal plate 14 of the door 2.

Moreover, in the external plate 12 of the cold-insulation container mainbody 1 and in the external plate 15 of the door 2, the thickness t2 ofthe reinforcement projecting portions 25 and 26 is greater than thethickness t3 of portions other than the reinforcement projectingportions 25 and 26.

More specifically, the thickness t4 of the internal plate 11 of theexternal wall of the cold-insulation container main body 1 and theinternal plate 14 of the second door 2 is, for example, 0.8 mm. On theother hand, in the external plate 12 of the external wall of thecold-insulation container main body 1 and in the external plate 15 ofthe door 2, the thickness t2 of the reinforcement projecting portions 25and 26 is, for example, 1.5 mm and the thickness t3 of portions otherthan the reinforcement projecting portions 25 and 26 is, for example,1.1 mm.

Further, the amount (L) of projection of the reinforcement projectingportions 25 and 26 is set such that the reinforcement projectingportions 25 and 26 project 5 mm or more beyond the portions other thanthe reinforcement projecting portions 25 and 26.

Furthermore, in the external plates 12 and 15 of the portioncorresponding to the cold-insulation chamber 5, the reinforcementprojecting portions 25 and 26 are formed such that the occupation ratioof the reinforcement projecting portions 25 and 26 is greater than thatof the other portions. That is, in the four lateral faces of thecold-insulation container main body 1 except for the machine chamber 6,the occupation ratio of the reinforcement projecting portions 25 and 26is equal to or greater than that of the other recessed portions.

On the other hand, the elastic member 33 and 34 are formed, in crosssection, into an L-shape. And, formed in the reinforcement projectingportion 25 of the external wall of the cold-insulation container mainbody 1 and in the reinforcement projecting portion 26 of the door 2 areattachment grooves 25 a and 26 a for the elastic members 33 and 34.

The attachment grooves 25 a and 26 a are formed by inwardly denting theexternal plate 12 of the cold-insulation container main body 1 and theexternal plate 15 of the door 2. And, the attachment grooves 25 a and 26a correspond to the bottom width of the elastic members 33 and 34,wherein the bottom of the elastic members 33 and 34 are attached byadhesive to the attachment grooves 25 a and 26 a.

Accordingly, in the present embodiment, the thickness of the externalplate 12 of the cold-insulation container main body 1 and the externalplate 15 of the door 2 is made greater than the thickness of theinternal plate 11 of the cold-insulation container main body 1 and theinternal plate 14 of the door 2, so that it is possible to make theinsuring of weight reduction and the insuring of strength compatible.That is, the strength is secured by increasing the thickness of theexternal plates 12 and 15 to which great force such as collision load isapplied and the reduction in weight is achieved by reducing thethickness of the internal plates 11 and 14.

Furthermore, the thickness of the reinforcement projecting portions 25and 26 of the external plates 12 and 15 is made greater than that of theother portions, so that it is possible to maintain a certain degree ofstrength sufficient enough to withstand collision load et cetera.

Moreover, the reinforcement projecting portions 25 and 26 project 5 mmor more, therefore insuring a sufficient degree of strength againstcollision et cetera.

Further, in the external plates 12 and 15 of the portion correspondingto the cold-insulation chamber 5, the occupation ratio of thereinforcement projecting portions 25 and 26 is made equal to or greaterthan that of the other portions, so that a specified degree of strengthis insured positively.

Furthermore, the attachment grooves 25 a and 26 a for the elasticmembers 33 and 34 are formed in the external plates 12 and 15. Thisincreases the section modulus of the external plates 12 and 15, therebyimproving the strength to a further extent.

Moreover, the elastic members 33 and 34 are attached into the attachmentgrooves 25 a and 26 a, thereby making it possible to perform accuratepositioning of the elastic members 33 and 34.

Other structure, action, and effects of the present embodiment are thesame as the seventh embodiment. Further, the structure of the externalplates 12 and 15 and the structure of the internal plates 11 and 14(e.g., their thicknesses) may be applied to the cold-insulationcontainer of the first embodiment.

Other Embodiment

The description of each of the foregoing embodiments has been made interms of cold-insulation containers which are equipped with arefrigerating apparatus. However, the present invention is applicable tocold-insulation containers without a refrigerating apparatus. That is,the present invention is applicable to a cold-insulation container usingonly a cold-storage material.

Industrial Applicability

As described above, the cold-insulation containers of the presentinvention are useful when loaded on a truck for transportation.Particularly, the cold-insulation containers of the present inventionare suitable for securing a specified amount of load when loaded in atruck bed.

What is claimed is:
 1. A cold insulation container comprising acold-insulation container main body (1) which is a heat-insulationstructure, a door (2) for opening and closing an opening portion (4) ofsaid cold-insulation container main body (1), and cold-keeping means (3)which is disposed in said cold-insulation container main body (1),wherein said cold-keeping means (3) includes a refrigerating apparatus(19) which is positioned in said cold-insulation container main body (1)and a cold-storage device (20) which is cooled by said refrigeratingapparatus (19) and stores cold; wherein an external wall of saidcold-insulation container main body (1) and said door (2) are formedfrom a synthetic resin material; and wherein outwardly projectingportions (25, 26) for reinforcement are formed on said external wall ofsaid cold-insulation container main body (1) and on said door (2),respectively.
 2. A cold-insulation container comprising acold-insulation container main body (1) which is a heat-insulationstructure, a door (2) for opening and closing an opening portion (4) ofsaid cold-insulation container main body (1), and cold-keeping means (3)which is disposed in said cold-insulation container main body (1),wherein an external wall of said cold-insulation container main body (1)and said door (2) are formed from a synthetic resin material; andwherein outwardly projecting portions (25, 26) for reinforcement areformed on said external wall of said cold-insulation container main body(1) and on said door, (2), respectively.
 3. The cold-insulationcontainer of claim 1 or claim 2, wherein said external wall of saidcold-insulation container main body (1) and said door (2) areconstructed by filling a heat-insulation material (13) between asynthetic-resin internal plate (11) and a synthetic-resin external plate(12), and by filling a heat-insulation material (16) between asynthetic-resin internal plate (14) and a synthetic-resin external plate(15); and wherein said reinforcement projecting portions (25, 26) areformed by causing said external plates (12, 15) to project outwardly. 4.The cold-insulation container of claim 3, wherein ribs (29,30) forconnecting said internal plates (11, 14) to said external plates (12,15) are formed at base portions of said reinforcement projectingportions (25, 26).
 5. The cold-insulation container of claim 3, whereinoutwardly-facing projecting portions (31, 32) corresponding to saidreinforcement projecting portions (25, 26) are formed at portions ofsaid internal plates (11, 14) corresponding to said reinforcementprojecting portions (25, 26).
 6. The cold-insulation container of claim3, wherein the thickness of said reinforcement projecting portion (25)of said external plate (12) in said external wall of saidcold-insulation container main body (1) is greater than that of portionsof said external plate (12) other than said reinforcement projectingportion (25).
 7. The cold-insulation container of claim 3, wherein saidreinforcement projecting portion (25) of said external plate (12) insaid external wall of said cold-insulation container main body (1)projects 5 mm or more.
 8. The cold-insulation container of claim 1 orclaim 2, wherein said external wall of said cold-insulation containermain body (1) and said door (2) are constructed by filling aheat-insulation material (13) between a synthetic-resin internal plate(11) and a synthetic-resin external plate (12), and by filling aheat-insulation material (16) between a synthetic-resin internal plate(14) and a synthetic-resin external plate (15); and wherein saidreinforcement projecting portions (25, 26) are formed outwardly from andintegrally with said external plates (12, 15), having therein spaceportions (27, 28).
 9. The cold-insulation container of claim 8, whereinribs (29, 30) for connecting said internal plates (11, 14) to saidexternal plates (12, 15) are formed at base portions of saidreinforcement projecting portions (25, 26).
 10. The cold-insulationcontainer of claim 8, wherein outwardly-facing projecting portions (31,32) corresponding to said reinforcement projecting portions (25, 26) areformed at portions of said internal plates (11, 14) corresponding tosaid reinforcement projecting portions (25, 26).
 11. The cold-insulationcontainer of claim 1 or claim 2, wherein said external wall of saidcold-insulation container main body (1) and said door (2) areconstructed by filling a heat-insulation material (13) between asynthetic-resin internal plate (11) and a synthetic-resin external plate(12), and by filling a heat-insulation material (16) between asynthetic-resin internal plate (14) and a synthetic-resin external plate(15); and wherein said reinforcement projecting portions (25, 26) areformed by increasing the thickness of said external plates (12, 15). 12.The cold-insulation container of claim 11, wherein ribs (29,30) forconnecting said internal plates (11, 14) to said external plates (12,15) are formed at base portions of said reinforcement projectingportions (25, 26).
 13. The cold-insulation container of claim 11,wherein outwardly-facing projecting portions (31, 32) corresponding tosaid reinforcement projecting portions (25, 26) are formed at portionsof said internal plates (11, 14) corresponding to said reinforcementprojecting portions (25, 26).
 14. The cold-insulation container of claim1 or claim 2, wherein elastic members (33, 34) are attached to outersurfaces of said reinforcement projecting portions (25, 26).
 15. Thecold-insulation container of claim 14, wherein hollow portions (35, 36)are defined in said elastic members (33, 34).
 16. The cold-insulationcontainer of claim 14, wherein attachment grooves (25 a, 26 a) for saidelastic members (33, 34) are formed in said reinforcement projectingportions (25, 26) in said external wall of said cold-insulationcontainer main body (1) and said door 2; and wherein said elasticmembers (33, 34) are attached into said attachment grooves (25 a, 26 a).17. The cold-insulation container of claim 1 or claim 2, wherein elasticmembers (33, 34) are attached to said external wall of saidcold-insulation container main body (1) and the door (2) so that saidelastic members (33, 34) project outwardly beyond said reinforcementprojecting portions (25, 26).
 18. The cold-insulation container of claim17, wherein hollow portions (35, 36) are defined in said elastic members(33, 34).
 19. The cold-insulation container of claim 1 or claim 2,wherein a recessed portion (42) is formed at a corner portion (C) ofportions sandwiching therebetween said reinforcement projecting portion(25) in said cold-insulation container main body (1), said recessedportion (42) extending astride both lateral walls from said cornerportion (C).
 20. The cold-insulation container of claim 19, wherein ahandle (41) that is held when handling said cold-insulation container ispositioned in said reinforcement projecting portion 25 sandwichedbetween said recessed portions (42).
 21. The cold-insulation containerof claim 1 or claim 2, wherein said external wall of saidcold-insulation container main body (1) and said door (2) areconstructed by filling a heat-insulation material (13) between asynthetic-resin internal plate (11) and a synthetic-resin external plate(12), and by filling a heat-insulation material (16) between asynthetic-resin internal plate (14) and a synthetic-resin external plate(15); and wherein the thickness of said external plates (12, 15) of saidcold-insulation container main body (1) and the door (2) is greater thanthat of said internal plates (11, 14) of said cold-insulation containermain body (1) and the door (2).
 22. The cold-insulation container ofclaim 1 or claim 2, wherein the occupation ratio of said reinforcementprojecting portions (25, 26) of said external wall of saidcold-insulation container main body (1) and said door (2). is equal toor greater than that of portions other than said reinforcementprojecting portion (25) of said external wall and said door (2).